Virtualize EventDispatchMediator creation and cleanup calling.

Source/core/events/GestureEvent.cpp

Index: Source/core/events/GestureEvent.cpp
diff --git a/Source/core/events/GestureEvent.cpp b/Source/core/events/GestureEvent.cpp
index 2fd3bcb5e04aba0c9b09bffb6ee67c6bfb85b5d0..d97d7e29a45f6ff5096989e07555b27cbdfbb91b 100644
--- a/Source/core/events/GestureEvent.cpp
+++ b/Source/core/events/GestureEvent.cpp
@@ -95,6 +95,11 @@ GestureEvent::GestureEvent(const AtomicString& type, PassRefPtrWillBeRawPtr<Abst
     setUICreateTime(uiTimestamp);
 }
 
+PassRefPtrWillBeRawPtr<EventDispatchMediator> GestureEvent::createMediator()
+{
+    return GestureEventDispatchMediator::create(this);
+}
+
 DEFINE_TRACE(GestureEvent)
 {
     MouseRelatedEvent::trace(visitor);